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   难度：Easy
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   <h1 class="question_title">
    742. To Lower Case
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   <p>
    Implement function ToLowerCase() that has a string parameter str, and returns the same string in lowercase.
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    &nbsp;
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     <strong>
      Example 1:
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<strong>Input: </strong><span id="example-input-1-1">"Hello"</span>
<strong>Output: </strong><span id="example-output-1">"hello"</span>
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      <strong>
       Example 2:
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<strong>Input: </strong><span id="example-input-2-1">"here"</span>
<strong>Output: </strong><span id="example-output-2">"here"</span>
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       <strong>
        Example 3:
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<strong>Input: </strong><span id="example-input-3-1">"LOVELY"</span>
<strong>Output: </strong><span id="example-output-3">"lovely"</span>
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   <h1 class="question_title">
    742. 转换成小写字母
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   <p>
    实现函数 ToLowerCase()，该函数接收一个字符串参数 str，并将该字符串中的大写字母转换成小写字母，之后返回新的字符串。
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    &nbsp;
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    <strong>
     示例 1：
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<strong>输入: </strong>"Hello"
<strong>输出: </strong>"hello"</pre>
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    <strong>
     示例 2：
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<strong>输入: </strong>"here"
<strong>输出: </strong>"here"</pre>
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    <strong>
     示例
    </strong>
    <strong>
     &nbsp;3：
    </strong>
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<strong>输入: </strong>"LOVELY"
<strong>输出: </strong>"lovely"
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